Calculate Fatigue Life of Custom Bolt

In summary, Ana is seeking guidance on calculating the fatigue life of a custom bolt she has manufactured, which is similar to a standard bolt. The bolt will be subjected to an axial load of 2000 pounds and has a shank diameter of .1250". She will need to determine the loading conditions, material, and stress concentrations in order to accurately calculate the fatigue life. It is recommended to refer to ASTM's specifications and consider factors such as material and heat treatment in the design.
  • #1
araanandv2
26
0
Hi All,

We have manufactured a custom bolt (similar to standard bolt).
Now we need to calculate the fatigue life of the bolt.
Could you please guide me in calculating the fatigue life?

Thanks,

Ana
 
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  • #2
araanandv2 said:
Hi All,

We have manufactured a custom bolt (similar to standard bolt).
Now we need to calculate the fatigue life of the bolt.
Could you please guide me in calculating the fatigue life?

Thanks,

Ana

What type of loading?

CS
 
  • #3
Basically, you'll need to know what the loading conditions are, what material the bolt is made out of, and the stress concentrations in the bolt. As long as you used a well-known material, you should be able to find an S-n diagram for it; but it will be up to you to figure out where the bolt will fail and under what conditions.
 
  • #4
There are standards for doing such tests. I would suggest a look through ASTM's specs.

It will also drastically depend on material, heat treat and what you have made custom in the design.
 
  • #5
Thank you.

I need to do Hand calculation.
The axial load on the bolt is around 2000 pounds.
The shank dia of the bolt is .1250".

Thanks,

Ana
 

1. What is fatigue life?

Fatigue life is the ability of a material or component to withstand repeated loading and unloading cycles without failure. It is an important factor to consider in the design and maintenance of structures and equipment that experience cyclic loading.

2. How is fatigue life calculated?

The fatigue life of a custom bolt is typically calculated using fatigue analysis methods such as the stress-life method or the strain-life method. These methods involve determining the stress or strain levels experienced by the bolt under cyclic loading and comparing them to the material's fatigue strength or endurance limit.

3. What factors affect the fatigue life of a custom bolt?

The fatigue life of a custom bolt can be affected by various factors such as the material used, the geometry and size of the bolt, the surface finish, the stress concentration, the type and magnitude of the loading, and the environmental conditions. Properly considering these factors is essential for accurate fatigue life calculations.

4. Can the fatigue life of a custom bolt be improved?

Yes, the fatigue life of a custom bolt can be improved by using materials with higher fatigue strength, optimizing the design to reduce stress concentrations, improving surface finish, and implementing appropriate surface treatments or coatings. Proper installation and maintenance practices can also help improve the fatigue life of a bolt.

5. Why is it important to calculate the fatigue life of a custom bolt?

Calculating the fatigue life of a custom bolt is important because it helps ensure the structural integrity of the components and prevents unexpected failures. It also helps optimize the design and material selection to improve the durability and reliability of the bolt, leading to cost savings and increased safety.

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